Air quality monitor



FIG. 1 is a front perspective view of an air quality monitor showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines are for the purpose of illustrating portions of the air quality monitor that form no part of the claimed design. 

CLAIM The ornamental design for an air quality monitor, as shown. 